| Main Title |
Intercomparison of Atmospheric Nitric Acid Measurements at Elevated Ambient Concentrations. |
| Author |
Anlauf, K. G. ;
Wiebe, H. A. ;
Tuazon, E. C. ;
Winer, A. M. ;
Mackay, G. I. ;
|
| CORP Author |
Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;Atmospheric Environment Service, Downsview (Ontario). ;California Univ., Riverside. Statewide Air Pollution Research Center. ;Unisearch Associates, Inc., Concord (Ontario). |
| Publisher |
c1991 |
| Year Published |
1991 |
| Report Number |
EPA/600/J-91/074; |
| Stock Number |
PB91-196543 |
| Additional Subjects |
Nitric acid ;
Air pollution monitoring ;
Spectroscopic analysis ;
Air sampling ;
Atmospheric chemistry ;
Comparison ;
Air filters ;
Performance evaluation ;
Reprints ;
Glendora(California)
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB91-196543 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
9p |
| Abstract |
Several methods for measurement of ambient HNO3 were compared over a 9-day period during the Carbonaceous Species Methods Comparison Study at Glendora, CA, in August 1986. Hourly averaged HNO3 concentrations were in the range 0.5-25 ppbv, with hourly maxima each day in excess of 15 ppbv. The measurement methods included absorption by a nylon filter in an open-face filter pack (FP), a transition flow reactor tube (TRF) in conjunction with a nylon filter, tunable diode laser absorption spectroscopy (TDLAS) and Fourier transform infrared (FT-IR) spectroscopy. The latter method was chosen as the common method for comparison of the daytime HNO3 measurements (nighttime concentrations were below the 4 ppbv detection limit of the FT-IR). Comparing the mean daytime HNO3 mixing ratios, the 1-h FP method yielded 13.9 ppbv (vs 12.9 for FT-IR), the 1-h TDLAS was 11.7 ppbv (vs 13.2 for FT-IR) and the 12-h TFR was 11.4 ppbv (vs 12.0 for FT-IR). For the nighttime periods, the means of the 2-h FP and the 12-h TER were 1.2 and 0.95 ppbv, respectively. The measured means were within the uncertainties of the methods. |
| Supplementary Notes |
Pub. in Atmospheric Environment, v25A n2 p393-399 1991. Prepared in cooperation with Atmospheric Environment Service, Downsview (Ontario), California Univ., Riverside. Statewide Air Pollution Research Center, and Unisearch Associates, Inc., Concord (Ontario). |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Intercomparison of Atmospheric Nitric Acid Measurements at Elevated Ambient Concentrations. |
| Category Codes |
68A |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/09 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
120724975 |
| Origin |
NTIS |
| Type |
CAT |
